The addiColours Crochet Hook Set includes 9 addi Comfort Grip color-coded crochet hooks, in an easy-to-store travel case. The set includes addi’s color-coded hooks in sizes 2mm (approximately US A), 2.5mm (approximately US B), 3mm (approximately US C), 3.5mm (approximately US E), 4mm (approximately US F), 4.5mm (approximately US G), 5mm (approximately US H), 5.5mm (approximately US I), and 6mm (approximately US J).